Description of problem: Something to do with DRI. Will attach the server logs. (II) AIGLX: Suspending AIGLX clients for VT switch Backtrace: 0: /usr/bin/Xorg(xf86SigHandler+0x65) [0x479fe5] 1: /lib64/libc.so.6 [0x3ce24322a0] 2: /usr/lib64/xorg/modules/extensions//libdri.so(DRILock+0x47) [0x7b838a7] 3: /usr/lib64/xorg/modules/drivers//intel_master_drv.so [0x6549a77] 4: /usr/bin/Xorg(AbortDDX+0x8d) [0x460acd] 5: /usr/bin/Xorg(AbortServer+0x18) [0x4f6048] 6: /usr/bin/Xorg(FatalError+0xd5) [0x4f6715] 7: /usr/lib64/xorg/modules/drivers//intel_master_drv.so(I830WaitLpRing+0x1c1) [0x653fe51] 8: /usr/lib64/xorg/modules/drivers//intel_master_drv.so(I830Sync+0x1b3) [0x6540223] 9: /usr/lib64/xorg/modules//libexa.so(exaWaitSync+0x8c) [0x3bef36c] 10: /usr/lib64/xorg/modules//libexa.so(ExaDoPrepareAccess+0xa5) [0x3bf0935] 11: /usr/lib64/xorg/modules//libexa.so [0x3bf1c68] 12: /usr/lib64/xorg/modules//libexa.so(exaShmPutImage+0x165) [0x3bf26e5] 13: /usr/bin/Xorg [0x506c87] 14: /usr/bin/Xorg [0x5080b5] 15: /usr/bin/Xorg(Dispatch+0x364) [0x446394] 16: /usr/bin/Xorg(main+0x45d) [0x42c87d] 17: /lib64/libc.so.6(__libc_start_main+0xfa) [0x3ce241e32a] 18: /usr/bin/Xorg(FontFileCompleteXLFD+0x279) [0x42bc59] Version-Release number of selected component (if applicable): xorg-x11-drv-i810-2.2.1-24.fc9.x86_64 mesa-libGL-7.1-0.31.fc9.x86_64 xorg-x11-server-Xorg-1.4.99.901-29.20080415.fc9.x86_64 gdm-user-switch-applet-2.22.0-5.fc9.x86_64 How reproducible: Every time. Reproduced on both i965 and i945. Steps to Reproduce: 1. Log in 2. f-u-s to another user 3. Attempt to f-u-s back to the first user Actual results: The first X server crashes. Display is trashed, HW state is fubar, you can no longer start any X servers without rebooting. Expected results: A working switch.
Created attachment 308483 [details] X log from the first server started (which crashed)
Created attachment 308484 [details] X log from the second server started
This bug looks similar: https://bugzilla.redhat.com/show_bug.cgi?id=482997
Just a note that there are now several similar reports with different hardware: Bug 482997, Bug 484516, Bug 450197, and Bug 439294.
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Now no longer crashes.